Padlock



NITED STATES MILTON Jackson, or rHILADnLPHIA, PENNSYLVANIA.

PADLOOK.

A pplicatinn filed January 4, 1886.

To all whom it may concern:

Be it known that l, MILTON JaoKsoN, a citizen of the United States,residing in Philadelphia, Pennsylvania, have invented certainImprovements in Padlocks, of which the following is a specification.

The object of my invention is to construct a padlock having but fewparts other than the tumblers, but so arranged that the shackle can bereadily secured or released, and so that no excessive pressure can bebrought to bear upon the tumblers for the purpose of feeling for thenotches of the same in attempting to pick the lock.

In the accompanying drawings, Figure l is a sectional View, partly inelevation, of my improved padlock, showing theshackle secured; Fig. 2, asimilar view showing the shackle released; Fig. 3, a detachedperspective view ef the working parts of the lock detached from thecasing; Fig. 4, a sectional plan of the lockcasing on the line l 2, Fig.2'; and Fig. 5, a vertical section on the line 3 4, Fig. 1, with part ofthe shackle in elevation.

A is the main shell or casing of the lock; AJ, the cover-plate, and Bthe shackle, which is pivoted to the casing by a pin, c, at one corner,in the usual manner, the other end of the shackle having a notched stem,b, which enters an opening, d, in the shell or casing A, this openingcontaining a plug, D, which is acted upon by a spring, j', beneath thesame, the release of the plug from the casing being prevented and itsrange of movement in said casing limited by a transverse pin, g,contained in the recess formed between flanges or collars t' at theopposite ends of the plug, as shown in Figs. l and 2. The tumblers F, ofwhich there are six in the present instance, are hung to a pin, m, inthe casing, and are acted upon by springs a, in the usual manner, so asto cause the tumblers to bear upon a seat, p, in the bottom of thecasing. Above the tumblers is a dog, G, which is hung to a pin, S, andhas three arms, fw w w?. The arm w is adapted to a recess, t, in asliding bolt, H, which is guided in an opening in the casing A, thefront end of the bolt when projected entering the notch o in the stem bof the shackle, as shown in Fig. l.. The arm yw of the dog has a nose,fr, and they arm wIl of the dog is acted upon by one of the springs n,so that when Serial No. 18'i,53i. (No model.)

the tumblers have been adjusted by the key J, as shown in Fig. 2, andthe notches y of the tumblers all brought yinto line with the nose a; ofthe dog, the said nose is caused to enter the notches, the arm fwthereby effecting the retraction of the bolt H, so as to release thestem b of the shackle and permit the projection of the same by thespring-plug D, as in Fig. 2. rlhe plug D Vwhen elevated bears againstthe end of the bolt H, and prevents the projection of 'the same untilthe stem of the shackle has been again inserted into the opening d andthe notch e of said stem brought into line with the bolt, whereupon,owing to the inclination of the tumblerniotches and of the nose .r ofthe dog, said nose will be ejected from the notches and the dog therebymoved, so as to project the bolt and retain the shackle.

As shown in Fig. et, the opening d, for the reception of the spring-plugD, is formed wholly in a thickened portion of the main shell VA. of thelock by means of a suitable boring-tool, the necessity of forming theopening by casting being thus obviated, and as this brings the openingslightly out of center transversely the stem b of the shackle islikewise made slightly out of center, as shown in Fig. 5.

My improved padlock has but few parts,

and is so constructed that the nose of the dogcannot be caused to bearwith excessive pressure upon the notched faces of the tumblers in orderto enable the notches of the same to be felt by any one attempting topick the lock, the security of the latter being thereby increased.

It will be evident that the tumblers may be operated by a turning-keyinstead of by a pushkey, if desired, and the lock may be modified invarious other respects without departing from the main feature of myinvention. For instance, the dog may be acted upon by a spring, as shownby dotted lines in Fig. 1, the arm 102 being dispensed with, and slidingtumblers may be used instead of the pivoted tum blers shown, as will bereadily understood.

I claim as my inventionl. The combination of the casing of a lock andthe shackle having anotched stem with the notched tumblrs, the slidingbolt engaging with the notched stem of the shackle, and a pivoted doghaving an arm engaging with said bolt, and a nose adapted to enter thenotches IOO of the tumblers when the latter have been adjusted by thekey, all substantially as specified.

2. The combination of the casing of a lock, the shackle having a notchedstein, the notched tumblers, the sliding` bolt engaging with the notchedstein of the shackle7 a spring-plug for ejecting the shackle whenreleased from the control of the bolt, anda pivoted dog havingXVitncsses: V an arm engaging with said bolt7 and having VILLIAM F.DAVIS, 1o also a nose entering the notches in the tmn- HARRY SMITH.

blers when the latter have been adjusted by the key, all substantiallyas specified.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

MILTON JACKSON.

